wgsl: Parenthesized expressions

[dj2]

• [ ] let a = (true);
• [ ] let a = (false);
• [ ] let a = (1.0);
• [ ] let a = (1.0h);
• [ ] let a = (-1i);
• [ ] let a = (1u);
• [ ] let a = 1u); -- fails
• [ ] let a = (); -- fails
• [ ] let a = (1u; -- fails

• https://www.w3.org/TR/WGSL/#parenthesized-expressions